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class HelloWorld
hello: (name = 'World') ->
"Hello, #{name}!"
module.exports = HelloWorld
Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.
Given two buckets of different size, demonstrate how to measure an exact number of liters.
Change the data format for scoring a game to more easily add other languages.
Parse and evaluate simple math word problems returning the answer as an integer.
Same language, better syntax. Use CoffeeScript anywhere JavaScript is used.
Inspired by Ruby and Python, CoffeeScript has a simple, readable, and easy-to-use syntax.
Easy to write, easy to read.
CoffeeScript can use any of the 1.3 million+ JavaScript libraries.
Combine JavaScript's power with your happiness
Use which ever paradigm you want: functional, object-oriented or imperative programming.
Every language has its own way of doing things. CoffeeScript is no different. Our mentors will help you learn to think like a CoffeeScript developer and how to write idiomatic code in CoffeeScript. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in CoffeeScript - they'll help you discover the things you don't know that you don't know.
Learn more about mentoring
The CoffeeScript track on Exercism has 79 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.
See all CoffeeScript exercises
The best part, it’s 100% free for everyone.